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DC – DC Converter For a Thermoelectric Generator

Stove. TEG. DC-DC Converter. Battery. DC – DC Converter For a Thermoelectric Generator. Supervisor: Dr. Maeve Duffy. Ciaran Feeney 4 th Electronic Engineering Student FYP Progress Presentation. Presentation Overview. Project overview Progress to date Future work and timeline

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DC – DC Converter For a Thermoelectric Generator

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  1. Stove TEG DC-DC Converter Battery DC – DC Converter For a Thermoelectric Generator Supervisor: Dr. Maeve Duffy Ciaran Feeney 4th Electronic Engineering Student FYP Progress Presentation

  2. Presentation Overview • Project overview • Progress to date • Future work and timeline • Questions

  3. Project Overview • Researchers in Trinity College Dublin are developing a energy harvesting system for use in developing countries. • Generate electricity using a Thermoelectric Generator(TEG) from excess heat produced during the cooking process. • Store energy generated in a battery • Use stored power in low power applications • This project focuses on providing an impedance match between the source and load using a DC-DC Converter and Microcontroller

  4. System Block Diagram

  5. Progress To Date • Thermoelectric generator operation understood • Battery charge and discharge profile established • DC-DC converter Topology determined • Basic analysis of 1st SEPIC DC-DC converter circuit complete • Suitable Microcontroller found • Website online and blog regularly updated

  6. Thermoelectric Generator Single Thermoelectric Couple Full Thermoelectric Generator

  7. Thermoelectric Generator

  8. Thermoelectric Generator Equivalent TEG Circuit Model

  9. Battery Charge and Discharge Profiles

  10. Battery Charge and Discharge Profiles

  11. DC-DC Converter • Require DC-DC converter that can provide an output voltage above and below input voltage • Variation of Buck Boost topology decided upon • SEPIC DC-DC Converter • Non-inverting output • Isolation between output and input terminals due to coupling capacitor

  12. DC-DC Converter SEPIC Topology SEPIC Converter 1st Prototype Chosen Components

  13. DC-DC Converter Input Voltage 4V Matched Voltage 2V Output Voltage .846V Duty Cycle 41.8% Efficiency 71.4% Resistive Load

  14. DC-DC Converter

  15. DC-DC Converter • Redesigned SEPIC Converter • Switching frequency is now 80kHz • Reduces size of components • Reduces cost • Diode Replaced by MOSFET • Circuit Components

  16. DC-DC Converter • New Design Replacing diode with MOSFET • Design includes Equivalent Series Resistances for components

  17. Microcontroller • Required characteristics • PWM (Pulse Width Modulation) • Analog Input pins • Low power consumption • Low cost • Easily programmable • Chosen Controller – Arduino Uno • Fulfills all of the above criteria • Cost €24.31 • Abundance of information available online

  18. Future Work • MPPT • Initial Investigation shows that load current should be maximized as the battery can be viewed as a purely voltage source. • Preliminary investigation into current sensors reveals that a hall effect sensor should be used instead of a current sense resistor. • Sensor to be placed in series with battery • A hall effect sensor has been singled out for further investigation The Allegro Microsystems Current Sensor • Rated for 5A • Low series resistance 1.2mΩ • Cost low €6.54 • 185mV per Amp

  19. Future Work • Charge Algorithm • Constant current to 3.6V • Constant voltage of 3.6V until charge cut off current is reached or 30 minutes has elapsed • Voltage to be monitored across battery • Yet to be decided whether a constant voltage will be applied • Researchers in Trinity College Dublin to decide this

  20. Future Work • Implementation of Circuit with • Thermoelectric Generator • Microcontroller implementing MPPT • Simulated cooking profile/Actual cooking duration • Battery • Efficiency analysis over cooking profile • Identify were improvements can be made

  21. Timeline • Efficiency Analysis • MPPT & Charge • Algorithm • 1st Draft of Mock Circuit Analysed and Deficiencies located. Circuit Optimised to minimise deficiencies. • 16th of January 2011 • Final Circuit and Testing • MPPT & Charge Algorithm decided upon and completed. • 14th of February 2011 • Bench Demonstration • Finished circuit completed incorporating MPPT and charge algorithm. Circuitry tested over full charge and discharge cycle with TEG and battery. • 7th of March 2011 • Week of the 14th of March 2011 • 1st of April 2011 • Final Thesis

  22. Questions

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